groovy.lang
Class GString

java.lang.Object
  groovy.lang.GroovyObjectSupport
      groovy.lang.GString

All Implemented Interfaces:

Buildable, GroovyObject, Writable, Serializable, CharSequence, Comparable

Direct Known Subclasses:

GStringImpl

public abstract class GString
extends GroovyObjectSupport
implements Comparable, CharSequence, Writable, Buildable, Serializable

Represents a String which contains embedded values such as "hello there ${user} how are you?" which can be evaluated lazily. Advanced users can iterate over the text and values to perform special processing, such as for performing SQL operations, the values can be substituted for ? and the actual value objects can be bound to a JDBC statement. The lovely name of this class was suggested by Jules Gosnell and was such a good idea, I couldn't resist :)

Version:

$Revision: 13100 $

Author:

James Strachan

See Also:

Serialized Form

Field Summary

static GString

EMPTY A GString containing a single empty String and no values.

Constructor Summary

GString(Object values)

GString(Object[] values)

Method Summary

void	build(GroovyObject builder)
char	charAt(int index)
int	compareTo(Object that)
boolean	equals(GString that)
boolean	equals(Object that)
abstract String[]	getStrings()
Object	getValue(int idx)
int	getValueCount()
Object[]	getValues()
int	hashCode()
Object	invokeMethod(String name, Object args) Overloaded to implement duck typing for Strings so that any method that can't be evaluated on this object will be forwarded to the toString() object instead.
int	length()
Pattern	negate() Turns a String into a regular expression pattern
GString	plus(GString that)
GString	plus(String that)
CharSequence	subSequence(int start, int end)
String	toString()
Writer	writeTo(Writer out) Writes this object to the given writer.

Methods inherited from class groovy.lang.GroovyObjectSupport

getMetaClass, getProperty, setMetaClass, setProperty

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

EMPTY

public static final GString EMPTY

A GString containing a single empty String and no values.

Constructor Detail

GString

public GString(Object values)

GString

public GString(Object[] values)

Method Detail

getStrings

public abstract String[] getStrings()

invokeMethod

public Object invokeMethod(String name,
                           Object args)

Overloaded to implement duck typing for Strings so that any method that can't be evaluated on this object will be forwarded to the toString() object instead.

Specified by:

invokeMethod in interface GroovyObject

Overrides:

invokeMethod in class GroovyObjectSupport

Parameters:

name - the name of the method to call

args - the arguments to use for the method call

Returns:

the result of invoking the method

getValues

public Object[] getValues()

plus

public GString plus(GString that)

plus

public GString plus(String that)

getValueCount

public int getValueCount()

getValue

public Object getValue(int idx)

toString

public String toString()

Specified by:

toString in interface CharSequence

Overrides:

toString in class Object

writeTo

public Writer writeTo(Writer out)
               throws IOException

Description copied from interface: Writable

Writes this object to the given writer.

This is used to defer content creation until the point when it is streamed to the output destination. Oftentimes, content will be defined but not necessarily created (as is may be the case with a Closure definition.) In that case, the output is then 'deferred' to the point when it is serialized to the writer. This class may be used whenever an object should be responsible for creating its own textual representation, but creating the entire output as a single String would be inefficient (such as outputting a multi-gigabyte XML document.)

Specified by:

writeTo in interface Writable

Parameters:

out - the Writer to which this Writable should output its data.

Returns:

the Writer that was passed

Throws:

IOException - if an error occurred while outputting data to the writer

build

public void build(GroovyObject builder)

Specified by:

build in interface Buildable

equals

public boolean equals(Object that)

Overrides:

equals in class Object

equals

public boolean equals(GString that)

hashCode

public int hashCode()

Overrides:

hashCode in class Object

compareTo

public int compareTo(Object that)

Specified by:

compareTo in interface Comparable

charAt

public char charAt(int index)

Specified by:

charAt in interface CharSequence

length

public int length()

Specified by:

length in interface CharSequence

subSequence

public CharSequence subSequence(int start,
                                int end)

Specified by:

subSequence in interface CharSequence

negate

public Pattern negate()

Turns a String into a regular expression pattern

Returns:

the regular expression pattern